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  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
    let addr= '北京市-市辖区-昌平区-23-23dddd'
   const res= addr.split('-')
   const arr=[]
  const addr1= res[res.length-1]
  for(let i=0;i<3;i++){
    arr[i]=res[i]
  }
  </script>
</body>
</html>